Patent US3786287A successfully refreshed from Google Patents.
US3786287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current motor system
Assignee: Individual
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Filing: 1971-12-27
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Granted: 1974-01-15
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Expires: 1991-12-27
Abstract
Abstract A direct current rotary apparatus of the type disclosed in U.S. Pat. No. 3,631,273, of which the present disclosure is a continuation-in-part, the improvement comprising a commutator switch having two arcuate blades, mounted for rotation with the rotor and evenly spaced thereon, and stationary segments connected to the stator coils. The segments are of like angular width and arranged in a circle for contact by the rotating blades which have an angular width approaching, but not greater than, 180* less the angular width of one of the segments. Thus, the stator coils are excited at all times except the relatively short time each blade contacts only one segment, when switching occurs.
Inventors
- 👤 J Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:09
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/62; H02K25/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A direct current rotary apparatus, comprising a stator having at least two pairs of like poles, each pole having a winding, a rotor having a shaft and two opposed magnetic poles, one always north and the other always south, rotatable within said stator, a commutator switch for the windings of said stator, said switch having two arcuate blades mounted on and extending radially from said shaft, two slip rings carried by said rotor and being connected to one and the other of said blades respectively, a plurality of relatively stationary segments angularly spaced uniformly about said shaft and contacted by said blades, a series connection between each opposite pair of segments and two corresponding opposed windings on opposite stator poles, said blades being equally spaced about said shaft and having an angular width approaching but not greater than 180* less the angular width of one segment.
Claim 2
Dependent Claim
146 words
A direct current rotary apparatus, comprising a stator having at least two pairs of like poles, each pole having a winding, a rotor having a shaft and two opposed magnetic poles, one always north and the other always south, rotatable within said stator, a commutator switch for the windings of said stator, said switch having two arcuate blades mounted on and extending radially from said shaft, two slip rings carried by said rotor and being connected to one and the other of said blades respectively, a plurality of relatively stationary segments angularly spaced uniformly about said shaft and contacted by said blades, a series connection between each opposite pair of segments and two corresponding opposed windings on opposite stator poles, said blades being equally spaced about said shaft and having an angular width approaching but not greater than 180* less the angular width of one segment.
Claim 3
Dependent Claim
36 words
Apparatus according to claim 1 wherein the number of pairs of poles are two and the number of segments are four, and the angular width of each blade approaches 90* but is not greater than 90*.
Claim 4
Dependent Claim
37 words
Apparatus according to claim 1 wherein the number of pairs of poles are four and the number of segments are eight, and the angular width of each blade approaches 135* but is not greater than 135* .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |